October: Ten Days That Shook the World is a 1928 Soviet silent historical film written and directed by Sergei Eisenstein and Grigori Aleksandrov. It is a celebratory dramatization of the 1917 October Revolution commissioned for the tenth anniversary of the event. Originally released in the Soviet Union as October, the film was re-edited and released internationally as Ten Days That Shook The World, after John Reed's popular 1919 book on the Revolution.

Soviet montage theory is an approach to understanding and creating cinema that relies heavily upon editing. It is the principal contribution of Soviet film theorists to global cinema, and brought formalism to bear on filmmaking.